Feeding apparatus for pulverized material



A. F. SINCLAIR.

FEEDING APPARATUS FOR PULVERIZED MATERIAL.

APPLICATION FILED JULY 15, I916- Patented Jan. 3, 1922.

. INI/ENTOR MA 514 M BI M'W $0 ATTORNEY memo rsneer, a

ire!) s'ra'rasl a nc um" filedlil'uly 15,

T all whom it may concern;

Be it knownhat L'Alinom F. Sincmm,

I a citizen of the United States; residin at New York City, in the county of New .ork and State of'New York, have. invented certam new anduseful Improvements in Feedmg Apparatus for Pulverized Material, of which the following is 'a specification. Thls invention relates to a device for feeding pulverized material, and isparticu- .larly adapted for feeding pulverized coal to aburner. Great diificuliw has been experienced'in malnng use of pulverized coal as fuel, owing to the fact that it has the quality offlow to almost the same extent as a liquid. As a result of this quality, ifthe' coal is fed by gravity or by means of any of the devices heretofore commonly used, there is constant danger that the coal will flow into the burner 'toofast, producing what is called flooding.

l have devised an apparatus by means of which finely pulverized coal may be fed continuously at a uniform rate without any. danger of too rapid flow or flooding. I. have accomplished this by placing in the path of the pulverized coal, between the hopper inwhich it is stored and the place where it is burned, a rotating cylinder provided with interrupted helical grooves; The "interrupted grooves constitute a series of pockets disposed ina helical line, so that as'the' cy1 inders rotate the coal carried in the grooves or pockets is deposited in the burner without material interruption and at a substanin connection with the accompanying drawis shown' in the drawings 1 the coal to be fed to the burner is placed.

, ings, in which? The/opening at the bottom of the hopper admits to a cylindrical chamber 2 in the easing 3, in'which is the grooved roller 4. This roller is keyed to anaxle .5 'which is journaled in the ends of the casmg. The roller has a close running fit with the inner sur- I face of the cylindrical casing 2, as near'liluidso gh as possible.

. in t dra ,as roller 4 i Specification of Letters Patent. i

' channel.

. In this hopper E ING AI iABA'I'US FOR. fun n. "W119!!! MA .r 1 .I

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in such a way that the shaft 9 rotates somewhat more rapidly than the shaft 5. The power for rotating the rollers may be applied to either of'these shafts.

An. opening-at the bottom of the cylindrical chamber 7 admits to a chute 10, which leadsthe'coal into the injector 11, whence it is blown into the burning chamber by a blast of air entering the left-hand end of the injector.' r

- In the operation of my apparatus the coal contained in the hopper 1 fills the grooves in the roller 4 as they pass acrossthe aperture in the bottom of the hopper. As the roller 4 rotates,- the contents of each groove is emptied into the channel 6. Owmg to the helical shape and the arrangement of the grooves, the forward end of one groove passes over the channel 6 just before the rear end of the preceding groove passes away from the channel. a continuous emptying of the coal into the The fact that the grooves are interrupted prevents the coal from flowing from one end of a groove to the other and maintains an even distribution of the coal in "each groove. In this way a uniform flow of coal is assured;

The coal poured into the channel 6 from the grooves of the roller 4: is uniformly distributed in the grooves and roller 8 as they pass under the channel and is emptied from these grooves into the chute 10, and so enters the burner ll in a unform and continuous flow.

The roller 8 is rotated more rapidly than the roller 4:, in order to avoid any danger of the clogging of thechannel 6.

While I prefer to use two rollers, as illustrated, as an extra precaution against the possibility of flooding, it should be noted that the device will operate and will feed the coal uniformly and continuously with the use of. but a single grooved cylinder. The second cylinder is'necessary only when the'coal leaks by the first cylinder. 3 Such This results in leaking can be prevented by a perfect fit of the first linder in its casing. But I prefer to use the second cylinder to eliminate the possibility of flooding should such leakage occur. 1 I

While I have described my device as used to feed pulverized coal toa burner, I wish it clearly understood that my invention, while very valuable for this purpose, is by no means limited to this use. The apparatus may advantageously be used whenever it is desirable to feed. a pulverized material uniformly and continuously without danger of too rapid flow or flooding.

'I claim u 1. An apparatus for feeding pulverized material, comprising a casing, connected to the hopper in which the material is placed, and enclosing a cylindrical chamber connected at its top with said hopper, a second 0 lindrical chamber below. said first mentioned cylindrical chamber, and a channel connecting said chambers; a roller having helical grooves in said upper cylindrical chamber, means for rotating said roller;a

second roller having helical grooves in said lower cylindrical chamber, and means for rotating said lower roller at a greater speed than said upper roller.

2. An apparatus for feeding pulverized roller. ARNOLD F. SINCLAIR. 

